#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
package ${package}.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Random;

/**
 * 验证码信息
 * 
 * @author caoqiang
 *
 */
public class CaptchaCodeUtils {

	// 宽度
	private static final int CAPTCHA_WIDTH = 100;
	// 高度
	private static final int CAPTCHA_HEIGHT = 35;
	// 数字的长度
	private static final int NUMBER_CNT = 4;
	// 图片类型
	private static final String IMAGE_TYPE = "JPEG";

	private Random r = new Random();
	// 字体
//  private String[] fontNames = { "宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312" };
	private String[] fontNames = { "宋体", "黑体", "微软雅黑" };

	// 可选字符
	private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";

	// 背景色,白色
	private Color bgColor = new Color(255, 255, 255);

	// 验证码上的文本
	private String text;

	private static CaptchaCodeUtils utils = null;

	/**
	 * 实例化对象
	 * 
	 * @return
	 */
	public static CaptchaCodeUtils getInstance() {
		if (utils == null) {
			synchronized (CaptchaCodeUtils.class) {
				if (utils == null) {
					utils = new CaptchaCodeUtils();
				}
			}
		}
		return utils;
	}

	/**
	 * 创建验证码
	 * 
	 * @param path 路径地址
	 * @return
	 * @throws Exception
	 */
	public String getCode(String path) throws Exception {
		BufferedImage bi = utils.getImage();
		output(bi, new FileOutputStream(path));
		return this.text;
	}

	/**
	 * 生成图片对象，并返回
	 * 
	 * @return
	 * @throws Exception
	 */
	public CaptchaCode getCode() throws Exception {
		BufferedImage img = utils.getImage();

		// 返回验证码对象
		CaptchaCode code = new CaptchaCode();
		code.setText(this.text);
		code.setData(this.copyImage2Byte(img));
		return code;
	}

	/**
	 * 将图片转化为 二进制数据
	 * 
	 * @param img
	 * @return
	 * @throws Exception
	 */
	public byte[] copyImage2Byte(BufferedImage img) throws Exception {
		// 字节码输出流
		ByteArrayOutputStream bout = new ByteArrayOutputStream();

		// 写数据到输出流中
		ImageIO.write(img, IMAGE_TYPE, bout);

		// 返回数据
		return bout.toByteArray();
	}

	/**
	 * 将二进制数据转化为文件
	 * 
	 * @param data
	 * @param file
	 * @throws Exception
	 */
	public boolean copyByte2File(byte[] data, String file) throws Exception {
		ByteArrayInputStream in = new ByteArrayInputStream(data);
		FileOutputStream out = new FileOutputStream(file);
		try {
			byte[] buff = new byte[1024];
			int len = 0;
			while ((len = in.read(buff)) > -1) {
				out.write(buff, 0, len);
			}
			out.flush();
			return true;
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		} finally {
			out.close();
			in.close();
		}
	}

	/**
	 * 生成随机的颜色
	 * 
	 * @return
	 */
	private Color randomColor() {
		int red = r.nextInt(150);
		int green = r.nextInt(150);
		int blue = r.nextInt(150);
		return new Color(red, green, blue);
	}

	/**
	 * 生成随机的字体
	 * 
	 * @return
	 */
	private Font randomFont() {
		int index = r.nextInt(fontNames.length);
		String fontName = fontNames[index];// 生成随机的字体名称
		int style = r.nextInt(4);// 生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)
		int size = r.nextInt(5) + 24; // 生成随机字号, 24 ~ 28
		return new Font(fontName, style, size);
	}

	// 画干扰线
	private void drawLine(BufferedImage image) {
		int num = 5;// 一共画5条
		Graphics2D g2 = (Graphics2D) image.getGraphics();
		for (int i = 0; i < num; i++) {// 生成两个点的坐标，即4个值
			int x1 = r.nextInt(CAPTCHA_WIDTH);
			int y1 = r.nextInt(CAPTCHA_HEIGHT);
			int x2 = r.nextInt(CAPTCHA_WIDTH);
			int y2 = r.nextInt(CAPTCHA_HEIGHT);
			g2.setStroke(new BasicStroke(1.5F));
			g2.setColor(randomColor()); // 随机生成干扰线颜色
			g2.drawLine(x1, y1, x2, y2);// 画线
		}
	}

	// 随机生成一个字符
	private char randomChar() {
		int index = r.nextInt(codes.length());
		return codes.charAt(index);
	}

	// 创建BufferedImage
	private BufferedImage createImage() {
		BufferedImage image = new BufferedImage(CAPTCHA_WIDTH, CAPTCHA_HEIGHT, BufferedImage.TYPE_INT_RGB);
		Graphics2D g2 = (Graphics2D) image.getGraphics();
		g2.setColor(this.bgColor);
		g2.fillRect(0, 0, CAPTCHA_WIDTH, CAPTCHA_HEIGHT);
		return image;
	}

	// 调用这个方法得到验证码
	public BufferedImage getImage() {
		BufferedImage image = createImage();// 创建图片缓冲区
		Graphics2D g2 = (Graphics2D) image.getGraphics();// 得到绘制环境
		StringBuilder sb = new StringBuilder();// 用来装载生成的验证码文本
		// 向图片中画4个字符
		for (int i = 0; i < NUMBER_CNT; i++) {// 循环四次，每次生成一个字符
			String s = randomChar() + "";// 随机生成一个字母
			sb.append(s); // 把字母添加到sb中
			float x = i * 1.0F * CAPTCHA_WIDTH / NUMBER_CNT; // 设置当前字符的x轴坐标
			g2.setFont(randomFont()); // 设置随机字体
			g2.setColor(randomColor()); // 设置随机颜色
			g2.drawString(s, x, CAPTCHA_HEIGHT - 5); // 画图
		}
		this.text = sb.toString(); // 把生成的字符串赋给了this.text
		drawLine(image); // 添加干扰线
		return image;
	}

	/**
	 * 返回验证码图片上的文本
	 * 
	 * @return 返回验证码图片上的文本
	 */
	public String getText() {
		return text;
	}

	// 保存图片到指定的输出流
	public static void output(BufferedImage image, OutputStream out) throws IOException {
		ImageIO.write(image, IMAGE_TYPE, out);
	}

	// 图片验证码对象
	public static class CaptchaCode {
		// 验证码文字信息
		private String text;
		// 验证码二进制数据
		private byte[] data;

		public String getText() {
			return text;
		}

		public void setText(String text) {
			this.text = text;
		}

		public byte[] getData() {
			return data;
		}

		public void setData(byte[] data) {
			this.data = data;
		}
	}
}